Some times I need to check the typesetting - wither I've made a formula right. For such cases I need to have an interactive TeX interpreter -- with no customisations - I just want to check the formula. Maybe You know something like that?

Could you define a little more precise what you mean when you say that you want to "check the formula"?
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SpeldosaNov 3 '11 at 11:00

I mean sometimes I write a TeX code in the forum for example - and I want to make sure it'll render correctly.
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AdobeNov 3 '11 at 11:06

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@Adobe This is mathjax which is a JavaScipt application based on TeX.
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Yiannis LazaridesNov 3 '11 at 11:14

Which forum? There are lots of maths-enabled fora and there are several ways to get maths rendered. Although many are based on TeX syntax, not many actually use TeX. MathJaX is one, iTeX is another. If you could be more specific, it might be easier to help you.
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Loop SpaceNov 3 '11 at 11:23

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None of the solutions (including your own) is actually what you want. What you need is a webpage with a text box in which you could write some LaTeX maths and have MathJaX work on the result. That doesn't involve TeX at all.
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Loop SpaceNov 3 '11 at 13:54

Could you add a little more detail? It is better to explain in the post what a link is about so that someone can have a reasonable idea what they are going to click on and make an initial assessment as to the value of the contribution without having to click on links. Thanks.
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Loop SpaceNov 3 '11 at 13:36

For Mac OSX there is the superb LaTeXit LaTeXit tool for this purpose. It even provides means to copy&paste the resulting PDFs into other applications (such as Keynote or LyX) with the LaTeX code embedded into the PDF metadata. Thereby you (or your colleague) can later copy&paste it back to LaTeXit to edit the results.